Preheat oven to 400 °F . Line muffin pans with 18 paper or foil muffin liners. Set aside.
In a large bowl, combine both flours, sugar, baking powder, and salt.
In a small bowl, combine the eggs, buttermilk, and butter.
Stir wet ingredients into dry ingredients, just until moistened. Fold in blueberries.
Fill prepared muffin cups three-fourths full. Bake in preheated oven for 20-24 minutes, or until a toothpick inserted in the center muffin comes out clean.